Bicycle Gear Pre-Calc Problem

A bicycle's gear ratio is the number of times the freewheel turns for every turn of the chain wheel. The table shows the numbers of teeth in the freewheel and the chainwheel for the first five gears of of an 18-speed touring bicycle. The chainwheel completes one rotation for each gear. Find the angle through which the freewheel turns for each gear. Give answers in both degrees and radians.